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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d618fd8b733313c30457f75932d2730e212b9c39ebaa175098ec8bc438e0b9' 
  AND token = 'KcGNhSfwMVn6W00p2O5GpWvs5bcpwvW1tGJ+4wgUS0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}